Magnetic filter plug



Feb. 3, 1948. s z 2,435,517

MAGNETIC FILTER PLUG Filed Dec. 27, 1945 lure/nor @2 23 i iiz'er' B1 EMMA Patented Feb. 3, 1948 UNITED STATES PATENT "OFFICE 2,435,517 MAGNETIC FILTER, PLUG Harry Seltzer, Brooklyn, .N. Y.

Application December 27, 1945, Serial No. 637,334

This invention relates to novel and useful improvements and structural refinements in filter plugs and applies particularly to the filtering of lubricating oil in internal combustion engines,

The principal object of the'invention is to pro-- -vide a device of the character herein described in which a magnetic means is incorporated for removing particles of foreign matter which may find their way into the lubricating system.

A further object of the invention is to provide a filter plug from which the filtering element can be easily and conveniently removed for cleaning or replacement purposes.

Another object of the invention is to provide a filter plug which is particularly adapted for use with engines of automobiles and similar vehicles.

An additional object of the invention is to provide a filter plug which is of simple construction and which can be manufactured economically in large quantities.

With the above more important objects in view, and such other objects as may become apparent as this specification proceeds, the invention consists essentially of the arrangement and construction of parts as illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation showing the invention in position on a crank case.

Figure 2 is a central, cross-sectional view, taken in the plane of the line 2-2 in Figure 1.

Figure 3 is a cross-sectional View taken in the plane of the line .-3 in Figure 2.

Figure 4 is a cross-sectional view taken in the plane of the line i i of Figure 2.

Like characters of reference are used to designate like parts in the specification and throughout the several views.

Referring now to the accompanying drawings in detail, the invention consists of a vertically disposed, cylindrical housing I, open at the lower end thereo; and provided with an externally threaded adapter 2 on its closed, upper end. This adapter is receivable in a screw threaded aperture 3 which is usually provided in the sump 4 of the engine crank case to receive a drain plug.

The adapter 2 is formed with a central passage 5 which opens at the inner end thereof into a shallow recess 5 formed by an annular shoulder I. This shoulder extends around the junction of the inner wall of the housing i with the closed end thereof and its purpose will be hereinafter more fully described.

The inner wall of the housing I is internally threaded as indicated by the relerence numeral 2 and an externally threaded, cylindrical jacket, 9

2 Claims. (Cl. 210-.1.5)

engages the internally threaded wall as will be clearly apparent from the accompanying Figure 2.

The lower-end ofthe jacket 9 is formed integraily with a cap Ill which in'turn, is provided with 'a nut portion -I"-I whereby'it may be rotated by means-of-a suitable wrench. "The cap III is also formed with an annular shoulder I2 which bears against the open end of the housing I, a. suitable gasket I3 being interposed between the shoulder and the housin to prevent leakage. A similar gasket I4 is also interposed between the upper end of the housing 'I and the sump 4.

Positioned inside of the jacket 9 upon the cap I0 is a disc-like, permanent magnet I5 provided with a diametrically extending depression I6 in the upper surface thereof, while the remaining, elevated portions ll of this surface constitute the magnet poles.

Resting upon the poles I! of the magnet I5 is a circular, wire mesh receptacle I8 containing a filling of steel wool I9. This receptacle, together with the associated filling, constitutes a filtering element which is retained in position on top of the magnet I5 by means of a baffle plate 20. The latter is provided with a plurality of apertures ZI and is positioned with the circumferential edge thereof between the upper end of the jacket 9 and the afore-mentioned shoulder I.

In order to prevent dissipation of magnetic force into the surrounding wall of the jacket 9, an enclosure 22 may be positioned around and under the magnet, the enclosure being formed from non-magnetic material such as aluminum, etc., and comprising a circular bottom 23 and a circumferential wall 24. The enclosure is positioned in the jacket 9, with the bottom 23 being interposed between the magnet I5 and the cap Ill, and the wall 24 extending somewhat above the level of the magnet poles I'I.

Havin thus described the structural details of the invention, its method of operation will now be presented.

When the invention is placed in operation, it is threaded into the drain plug aperture 3 of the sump 4 so that the oil in the latter may fill the interior of the jacket 9 through the passage 5 and through the apertures 2|.

The steel wool filling I9 will become energized by the poles of the magnet I5 and particles of foreign matter present in the body of oil will accumulate in the filtering element.

The element may be readily and conveniently removed for cleaning or replacement purposes by unscrewing the jacket 9 from the housing I,

, 3 whereupoii all internal components of the invention will become immediately accessible.

, What I claim as my invention is:

1. In association with an automobile crank shoulder adjacent the upperend of said inner H 7 wall, an externally threaded jacket engaging said inner wall, said adapter being receivable in said a drain aperture and the interior of said jacket communicating through said passage with said sump, an integral cap atthe lower end of said jacket, an annular shoulder on said cap bearing against the lower end of said housing, a disc shaped, permanent magnet positioned in said *jacket on said cap, said magnet having a diametricallvextending depression formed in the upper surface thereof, the remaining elevated portions-of said surface defining the poles of said magnet-a circular, wire mesh receptacle resting on said poles, a filling or steel wool in said c 4. receptacle, and a circular bai'fle plate having a plurality of apertures formed therein, said bafile 1 plate being positioned between said annular "shoulder of said housing vand the upper end of said jacket. 1 a a 2. In association withthe device as defined in claim 8, an enclosure formed fromlnon-magnetic material and comprising, in combination, a circular bottom and a circumferential wall integral therewith, said enclosure being positioned in said jacket with said bottom interposed between said magnet and said cap, and said circumferential wall extending above the level of said magnet HARRY SELTZER.

' REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number a Name Date 1,659,136 Cuttin Feb. 14, 1928 1,944,208 Bock Jan. 23, 19.34 7 1,683,780 Hulsmeyer Sept. 11, 1928 Lambert Feb. 17, 1925 

